Saw



M. JOHNSON Dec. 8, 1942.

SAW

Filed April 8, 1941 mm \n mm *NWNIM v if a/1128072 Patented Dec. 8, i9422,iiti,693 1 2,304,693 sAw Matt Johnson, Naselle, Wash.

Application April 8, 1941,

1 Claim.

This invention relates to a sa but more particularly to the form of thecutting units thereof.

A cutting unit in accordance with this invention is designed primarilyfor cross-cut and falling saws, but it is to be understood that it isfor use in any connection for which it may be found applicable.

The invention aims to provide, in a manner as hereinafter set forth, acutting unit forming an element of a saw which is so constructed whenthe saw is used as to expeditiously cut logs or other wooden bodies forwhich it is adapted.

The invention further aims to provide, in a manner as hereinafter setforth, a saw including raker teeth so formed and arranged to therebyprovide for the quick cutting of logs'or other wooden bodies.

The invention further aims to provide, in a manner as hereinafter setforth, a saw including raker teeth capable of being easier to file thanthe raker teeth now generally employed and requiring less time forfiling than the period required for filing the general form of rakerteeth now employed.

The invention further aims to provide, in a manner as hereinafter setforth, a saw including raker teeth whereby it is not necessary to employa three-cornered file for sharpening them.

The invention provide, in a manner as hereinafter set forth, a sawincluding raker teeth whereby it is not necessary, when sharpening tofile the entire wall or edge of the gullet or recess between them, oruse a threecornered file as the teeth are so formed and arranged thatwhen sharpening it only requires a filing action on the tips thereofwith a fiat file.

The invention further aims to provide, in a manner as hereinafter setforth, a saw having the gullets of the desired size arranged between theteeth to take care of the shavings when the saw is drawn in eitherdirection.

The invention further aims to provide, in a manneras hereinafter setforth, a saw of the type referred to, which is simple in itsconstruction and arrangement, strong, durable, compact, thoroughlyefiicient when used and comparatively inexpensive to manufacture.

Embodying the aims aforesaid and others which may hereinafter appeantheinvention consists of the novel construction, combination andarrangement of parts as will be more specifically described andillustrated inthe accompanying drawing, wherein is shown an embodimentof the invention,.but it is tobe understood that body part 6 isindicated at I I8, I9, 20 and 2| Serial No. 387,500

changes, variations and modifications may be resorted to which fallwithin the scope of the invention as claimed. 7 p

A saw in accordance with this invention is to include two or moreendwise aligned like cutting units, the number of such units dependingupon the length of the saw. The drawing to be referred to willillustrate the form of the cuttin unit in accordance with thisinvention.

In the drawing:

Figure l is a fragmentary section, in elevation of a saw, lookingtowards one face of the latter and showing the form of the cutting unit,

in accordance with this invention,

Figure 2 is a top plan view of the structure illustrated byFigure l,

Figure 3 is a section on line 3--3, Figure 1, and

Figure 4 is a fragmentary view upon an enlarged scale of the upperportion of the raker teeth of a saw.

The saw, generallyindicated at 5, includes a body part 6 of the desiredlength, width and thickness. The outer lengthwise .edge of the and issquared. Integral with and extended from the inner lengthwise edge ofbody part 6 will be a number of the endwise aligned like cutting units.only one of which is shown and indicated generally at 8. v

The unit 8 includes a base portion 9 which merges into the innerlengthwise edge of said body part 6, three spaced sets of spaced cuttingteeth and two spaced pairs of spaced raker teeth. The cutting teeth andraker teeth extend outwardly from and are integral with the base portion9. The number of cutting teeth of each set will preferably be four andare so shown. The cutting teeth of one set are indicated at H), H, l2and 13. The cutting teeth of another set are designated at Hi, i5, i6and i1 and the cutting teeth of the other set are indicated at l8, I9,20 and 2|. The teeth of one pair of raker teeth are designated 22 and 23and the teeth of the other pair of raker teeth are designated 25 and 25.The cutting tooth l3 opposes and is spaced from the raker tooth 22. Thecutting tooth l4 aligns with and is spaced from the raker tooth 23. Thecutting tooth l'l opposes and is spaced from the raker tooth 24. Thecutting tooth l8 opposes and is spaced from the raker tooth 25. Thecutting teeth W, H, 12 and I3 are termed an outer set of cutting teeth.The cutting teeth cutting teeth and the cutting teeth l4, l5, l6 and I!are termed a central set of cuttingteeth,

are termed a second outer set of teeth In, H,

The raker teeth 22, 23 are arranged between the central set and thefirst outer set of cutting teeth. The raker teeth 24, 25 are arrangedbetween the central set and the second outer set of cutting teeth.

The outer portions of the following side edges of the teeth It, |2, |3are curved towards the left. The outer portions of the following sideedges of the teeth I4, l5 are curved towards the left. The outerportions of the following side edges of the teeth l6, I! are curvedtowards the right. The outer portions of the following edges of theteeth I8, 29 are curved towards the left. The outer portions of thefollowing side edges of the teeth l9, 2| are curved towards the right.The outer portions of the following side edges of the teeth 22, 24 arecurved towards the left and the outer portions of the following sideedges of the teeth 23, 25 are curved towards the right.

The outer portions of the leading side edges of I2 and I3 are directedtowards the right and such portions are of less length than the curvedouter portions on the following side edges of such teeth. The outerportions of the leading side edgesof the teeth |4, |5 are directedtowards the right and areof less length than the curved portions on thefollowing side edges of such teeth. The outer portions of the leadingside edges of the teeth I6, 1! are directed toward the left and are ofless length than the curved portions on the follower side edges of suchteeth. The outer portions of the leading side edges of the teeth H3, 20are directed towards the right and are of less length than the curvedportions on the following side edges of such teeth. The outer portion ofthe leading side edges of the teeth l9, 2| are directed towards theright and are of less length than the curved portions on the followingside edges of such teeth.

The inner portions of the side edges of the teeth Iii, l2, l4, |5,-|5,l8, l9 and '20 are straight. The inner portions of the following sideedges of the teeth I! and 2| and the leading side edge of tooth |3 arestraight. The leading side edges of the teeth I? and 2| and thefollowing side edge of tooth |3 have straight intermediate portions 26and curved inner portions 21 directed towards the right.

The leading side edges of the teeth 22, 24 have u straight outerportions 28 and curved inner portions 29 directed towards the left. Thefollowing side edges of the teeth 22, 24 have straight inner portions35. The leading side edges of the teeth 23, 25 have straight outerportions 3| and curved inner portions 32 directed towards the right.

The-base 9 is formed with concave edge portions 33, 34, 35, 36, 31, 38,39, 4|], 4|, 42, and 43 of like radii, and concave edge portions 44, 45,46 and 4'! of like radii, but of greater radii than any one of the saidother concave edge portions. The following side edge of tooth l andleading side edge of tooth merge into edge portion 33 to form a gullet48. The following side edge of tooth and leading side edge of tooth l2merge into edge portion-34 to form a gullet 49. The following side edgeof tooth l2 and leading side edge of tooth |3 merge into edge portion'35 to form "a gullet 50. The following side edge of tooth 22 and thefollowing side edge of tooth 23 merge into edge portion 36 to form agullet The following side edge of tooth l4 and the leadingside edge oftooth |5 merge into edge portion 3'! to form a gullet 52. The followingside edge are arranged on the teeth I, I3, I5,

of tooth l5 and the following side edge of tooth l6 merge into the edgeportion 38 to form a gullet 53. The leading side edge of tooth l6 andthe following side edge of tooth |7 merge into edge portion 39 to form agullet 54. The following side edge of tooth 24 and the follower sideedge of tooth merge into edge portion 40 to form a gullet 55. Thefollowing side edge of tooth l8 and the following side edge of tooth 9merge into edge portion 4| to form a gullet 56. The leading side edge oftooth l9 and'the leading side edge of tooth 20 merge into edge portion42 to form a gullet 51. The following side edge of tooth 20 and thefollowing side edge of tooth 2| merge into the edge portion 43 to form agullet 58.

The following side edge of tooth 3 and the leading side edge of tooth 22merge into edge portion 44 to form a gullet 59. The leading side edge oftooth 23 and the leading side' edge of tooth l4 merge into edge portion45 to form a gullet 60. The leading side edge of tooth l1 and theleading side edge of tooth 24 merge into edge portion 46 to form agullet 6|. The leading side edge of tooth 25 and the leading side edgeof tooth |'8 merge into edge portion 4'! to form a gullet B2.

The bases of the gullets 48, 49, 50, 5|,52, 53, 54, '55, 56, 57 and 58are positioned at the bases of the teeth. The'bases of the gullets 59,60, 6| and 62 extend below the bases of the teeth I3, 22, 23, l4, l7,24,25 and I8. The gullets 59, 60, BI and 62 are of like width and depthand are each of materially greater width and slightly greater depth thanany one of the other gullets. The outer portion of the gullets 5| or isuniformly flared by the oppositely curving of the opposed followingedges of a pair of raker teeth. The open ends of the gullets 5|, 55 areof greater width than the open ends of the gullets formed between thecutting teeth. The inner portions of the gullets between the cuttingteeth correspond in width and also correspond in width to the width ofthe inner portions of the gullets formed between the raker teeth.

Each raker tooth has the outer end of one side edge disposed in closeproximity to the outer end of its other side edge. Formed integral withthe aforesaid ends is a .curved extension 63 constituting a raker blade.The extensions 63 on the raker teeth 22,24 are directed to the left. Theextensions 63 on the'raker teeth '23, 25 are directed tothe right. Inother-Words, the extensions'63 on the teeth of a pair ofraker teeth aredisposed in opposite directions. These extensions materially assist inthe raking operation provided'by the teeth 22,23, 24 and 25 and willprovide for cleaning'the -kerf when the saw is operated in oppositedirections.

The outer end portions of the cutting teeth are beveled to form cuttingedges. The bevels on the teeth l0, l2, l4, |6,'|8-and 20'are on thatside of such teeth opposite'the side on which the bevels I], 9, 2|. Thecutting and raker teeth are of uniform length and their outerlterm'iniand basesalign.

What I claim is:

In a saw, a body part and-a cutting unit formed of abase integral withsaid body part, an outer, a central and a second outer set of spacedcutting teeth extendedfromsaid base, a pair of spaced raker teethextended from said 'base'between said first outerand said'central setsof teeth, a secand pair of spaced raker teeth extended from said basebetween said second outer and said centr-al sets of teeth, the teeth ofeach set of teeth having gullets arranged therebetween, the raker teethof each pair having a gullet arranged therebetween, the bases of thegullets between said raker teeth aligning with the bases of the gulletsbetween said teeth in said sets, said first pair of raker teeth and saidfirst outer set of teeth having a gullet therebetween, said central setof teeth and said first pair of raker teeth having a gullet arrangedtherebetween, said central set of teeth and said second pair of rakerteeth having a gullet arranged therebetween, said second pair of rakerteeth and said second outer set of teeth having a gullet arrangedtherebetween, said outter and raker teeth being of a uniform length andhaving their outer ends aligned, the gullets between said sets of teethand pairs of raker teeth being of a greater depth than said gulletsbetween said cutting teeth and said gullets between said raker teeth,each raker tooth of each pair having extended from its outer end a rakeblade, the rake blades of the raker teeth of each pair being teeth andextending outwardly in opposite directions, the base of the gulletsbetween the cutting teeth being aligned with the gullets between theraker teeth and disposed above those gullets between the raker pair andthe cutting teeth sets and each tooth of the cutting teeth sets havingits cutting edge beveled away from the direction of cut and having itsfollowing edge curved toward the direction of cut, said first outer setof teeth having each of its teeth arranged to cut in a single directionand said central and said second outer sets of teeth having half oftheir teeth arranged to cut in one direction and half to cut in theopposite direction.

MATT JOHNSON.

disposed at an angle relative to the p

